function start() {
    let heartImg = document.getElementById('heart-img');
    let buttonStart = document.getElementById('buttonStart')
    console.log("animationPlayState --> ", heartImg.style.animationPlayState)
    if (heartImg.style.animationPlayState == 'running') {
        heartImg.style.animationPlayState = 'paused'
        buttonStart.innerHTML = "开始"
    } else {
        heartImg.style.animationPlayState = 'running'
        buttonStart.innerHTML = "暂停"
    }
    let heartImg2 = document.getElementById('heart-img2');
    if (heartImg2.style.animationPlayState === 'running') {
        heartImg2.style.animationPlayState = 'paused'
    } else {
        heartImg2.style.animationPlayState = 'running'
    }
}